I agree = انا موافق There are also some words with the same meaning such as = ماشى = اتفقنا = قشطة = OK I disagree = مش موافق = لأ = لأ معلش =لأ ياعم These are some things that will help you. https://ia801208.us.archive.org/13/items/maktabah2000_gmail_20160905/%D9%82%D8%A7%D9%85%D9%88%D8%B3%20%D8%A7%D9%84%D9%84%D9%87%D8%AC%D8%A9%20%D8%A7%D9%84%D8%B9%D8%A7%D9%85%D9%8A%D8%A9%20%D8%A7%D9%84%D9%85%D8%B5%D8%B1%D9%8A%D8%A9.pdf https://docs.google.com/file/d/0BwSf_0bx00XdM2VSS0stNmpid0k/edit

I agree = انا موافق/معاك فى دى \اه I disagreeلا/مش معاك فى دى

There is many words in Egyptian Arabic could be used for (agreement or disagreement ) But the best answers for this situations are ماشي ،حاضر ،موافق ,طيبfor agreement لا ، مش موافق for disagreement

As سمية said I agree In Egyptian Arabic could be mashi ماشي like "OK" or itfkna إتفقنا like "deal" or taib طيب like "OK" ...etc i disagree could be mish muafik مش موافق or la' لأ like "no" ...etc according to the situation and the sentence. if you want to learn any language try to listen for this language all the time with original language transcript like if you want to improve yourself in Arabic watch maybe Arabic program talking in Egyptian Arabic with Arabic transcript to learn how to pronunciate the words if you have good Arabic words stuff if not you can start with some courses i recommend this one to start from scratch https://www.youtube.com/watch?v=Qwdyx9kAPlU&t=129s I hope you find this useful Regards.